Literatura científica selecionada sobre o tema "Modélisations analytiques"
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Artigos de revistas sobre o assunto "Modélisations analytiques"
Migliore, Olivier. "Analyser l’interprétation vocale des musiques populaires avec le logiciel AudioSculpt : chronique d’une pratique de l’analyse musicale assistée par ordinateur". Musurgia Volume XXIX, n.º 3 (11 de setembro de 2023): 7–25. http://dx.doi.org/10.3917/musur.223.0007.
Texto completo da fonteStévance, Sophie. "La musique actuelle au Québec : enjeux et perspectives méthodologiques d’une analyse génétique". Intersections 38, n.º 1-2 (28 de setembro de 2020): 9–30. http://dx.doi.org/10.7202/1071672ar.
Texto completo da fonteVautier, Claude. "Cette étrange pliure à partir de laquelle rien n’est plus pareil. La question de la contingence en sciences sociales : l’événement". Articles hors thème 13, n.º 2 (5 de setembro de 2018): 265–91. http://dx.doi.org/10.7202/1051117ar.
Texto completo da fonteLachaud, Jean-Pierre. "Modélisation des déterminants de la pauvreté et marché du travail en Afrique: le cas du Burkina Faso". Recherches économiques de Louvain 66, n.º 3 (2000): 309–61. http://dx.doi.org/10.1017/s0770451800005121.
Texto completo da fonteGurov, Boris. "Modélisation analytique de l'action". European Journal of Sociology 48, n.º 2 (agosto de 2007): 317–44. http://dx.doi.org/10.1017/s0003975607000392.
Texto completo da fonteBai, J. B., J. L. Xie e A. Rodrigues. "Modélisation analytique du procédé de cofilage". Matériaux & Techniques 82, n.º 10 (1994): 25–32. http://dx.doi.org/10.1051/mattech/199482100025.
Texto completo da fonteVilleneuve, Paul, Catherine Trudelle, Mathieu Pelletier e Marius Thériault. "Les conflits urbains : une approche analytique". Environnement Urbain 3 (5 de outubro de 2010): d—1—d—8. http://dx.doi.org/10.7202/044601ar.
Texto completo da fonteAl Heib, Marwan, Mouhamad Hassoun, Huu-Luyen Nghiem, Fabrice Emeriault e Pascal Villard. "Modélisation physique à 1 × g pour l’étude des conséquences de mouvements de terrain et des moyens de mitigation". Revue Française de Géotechnique, n.º 166 (2021): 2. http://dx.doi.org/10.1051/geotech/2021003.
Texto completo da fonteOukid, Yanis, Vincent Libaud e Christophe Daux. "Apports et enjeux de la modélisation hydraulique 3D pour la conception et la réhabilitation des ouvrages hydrauliques". La Houille Blanche, n.º 3 (junho de 2020): 55–65. http://dx.doi.org/10.1051/lhb/2020029.
Texto completo da fonteMarques Filho, Ari de O. "MODELES DES TRANSFERTS RADIATIFS A L'INTERIEUR DES COUVERTS VEGETAUX LES SOLUTIONS ANALYTIQUES". Acta Amazonica 22, n.º 4 (dezembro de 1992): 541–65. http://dx.doi.org/10.1590/1809-43921992224565.
Texto completo da fonteTeses / dissertações sobre o assunto "Modélisations analytiques"
Bouley, Simon. "Modélisations analytiques du bruit tonal d'interaction rotor/ stator par la technique de raccordement modal". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC007/document.
Texto completo da fonteThe rotor-stator wake-interaction tonal noise, generated by the impingement of rotor wakes onoutlet guide vanes, plays a crucial role in the aerodynamic noise of axial-flow ducted fan stages. Thelatter are widely used in most aeronautic propulsion and air-conditioning systems. The noise predictionby means of numerical simulations remains expensive, especially at the preliminary design stage whennumerous configurations must be tested. In this respect, the analytical approach chosen in this thesisprovides a well suited alternative. The analytical modeling based on an isolated-airfoil response functioncan not reproduce the cascade effect introduced by the large number of stator vanes. Conversely, drasticapproximations are required to extend the current cascade response functions to three-dimensionalconfigurations. The proposed modeling based on the mode-matching technique simply introduces thecascade effect in an annular rotor-stator stage. A rectilinear cascade response function is firstly presentedto account for the acoustic transmission through the stator along with the wake-interaction noise.In this context, a linearized and non-viscous analysis is carried out, in which the acoustic and vorticalmodes of a gas are coupled at rigid physical boundaries. The velocity perturbations issued from thewakes are written as a sum of convected gusts. Their impingement on the cascade of vanes generatesacoustic waves propagating upstream, downstream of the cascade, as well as inside the inter-vane channelsof the stator, seen as a periodic array of bifurcated waveguides. The duct cross sections at theleading-edge and the trailing-edge of the vanes are seen as interfaces on which the continuity of thefluctuating pressure, axial velocity and vorticity is fulfilled. A system of linear equations is obtained,then solved by means of modal projections and matrix inversions. The acoustic field is then uniformlycalculated in the whole domain. Comparisons with rectilinear cascade response functions show a verygood agreement with predictions based on the Wiener-Hopf technique. The configuration of an annularcascade is addressed by introducing the Bessel functions as radial shape functions, expressing threedimensionaleffects. Finally, a procedure is presented to account for the heterogeneity of the statorvanes, typical of modern fan architectures. This approach is based on the combinaison of the leadingedgedipole principle and the cascade response function derived from the mode-matching technique.The edge-dipole principle identifies Amiet’s solution for the unsteady loading and the radiation of adipole approached very close to the edge of a half plane. The predictions provided by this modeling,applied in a two-dimensional configuration, are finaly compared to measurements performed in the testcampaign of the SEMAFOR project
Rabat, Amélie. "Modélisations analytiques ILCM d'enceintes résonantes munies d'ouvertures de formes complexes. Application au couplage avec des lignes de transmission". Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC092.
Texto completo da fonteThis PhD work is dedicated to shielding boxes modeling. Those shielding enclosure usually contains apertures, that are essential for cable cross or, for ventilation. They are commonly used to protect sensitive equipment from external radiated disruptions. Then, the capacity of a metallic shield to correctly limit parasitic interference and coupling is crucial to know for EMC designers. This coupling problem is particularly widespread in EMC domain that engineers have to anticipate. Several simulation tools are available to compute and analyze these electromagnetic problems. However, full wave numerical methods remains computationally intensive and take several hours to reach a solution. Analytical formulations may provide an attractive alternative using a far smaller computation time with a great accuracy, as ILCM models. Based on the transmission line theory, this technique is able to reproduce the electromagnetic cavity behavior and its apertures by means of a circuital approach. In fact, ILCM models considerably simplify the original problem by providing a simple equivalent circuit représentation of the electromagnetic problem. Our analysis deals with a fast, reliable and simple analytical formulation, in order to develop an helpful tool for shielding boxes design. In this document, we describe four improvements of the original model. These improvements have been made to renforce the initial formulation of Martin Paul Robinson, the method's pioneer, giving a more realistic description of the problem. However, our models focus predominantly on empty electromagnetic cavities containing apertures. Then, they constitutes an interesting intermediate step to model realistic shielding enclosures. The analytical ILCM approach has been validated for several configurations exemples, demonstrating the method potential
Druon, Yann. "Etude de la propagation guidée et du rayonnement acoustiques par les conduits d'éjection de turboréacteur : Modélisations analytiques et numériques". Ecully, Ecole centrale de Lyon, 2006. http://www.theses.fr/2006ECDL0002.
Texto completo da fonteThis work deals with the modeling of the acoustic propagation inside turbofan exhaust ducts and the corresponding radiation to the outside. The main objectives are, first, to develop analytical methods, enabling fast and flexible simulations of the problem, and second, to assess the relevance of different numerical methods, now indispensable to account for more realistic geometries and aerodynamic conditions. The study is performed following a progressive process, beginning with simplified configurations to integrate the elements of physical complexity one by one (presence of acoustic liners, realistic geometry, uniform and non-uniform mean flows…). At each stage, the results of the different methods are compared and the influence of the principal parameters is analyzed. The reference solution is given here by an analytical method based on the modal theory for annular ducts with constant cross section. The far field radiation is calculated, in the case of a hub truncated at the exit plane, using the flanged duct approximation, and for an infinite hub, with the aid of the Wiener-Hopf technique. In this last model, the possibility of vortex shedding from the duct trailing edge is included by application (or not) of a Kutta condition. At low frequency, and in the absence of mean flow, the Boundary and the Finite Element Methods (BEM and FEM) give the same results. The comparisons with measurements are also very good, confirming the relevance of the theoretical models. In the presence of a uniform mean flow, the BEM and the FEM respectively tend to the analytical solutions obtained with and without the Kutta condition imposed at the edge. The particular behavior associated to each method is thought to be related to the acoustic variable considered in the codes, i. E. Acoustic pressure or potential. At high frequency, the results of the Gaussian Beam Summation approach are found to be unsatisfactory, probably because of the absence of any diffraction model in the current code formulation. Several geometrical factors influence the acoustic propagation in the secondary exhaust duct (By-Pass). The most critical point lies in the presence of two bifurcations that induce modal redistributions increasing with the rotation of the incident wave inside the duct. An analytical model for sound propagation in a bifurcated duct is presented and validated by comparison with BEM results. Outside the ducts, the influence of the pylon and the after-body real geometry on the radiation to the ground seems to be more limited. Conversely, the effect of shear layers generated at the duct trailing edges is significant. In spite of theoretical restrictions, the waves refraction due to flow mismatches across a vortex sheet (Munt’s model) seems to be relatively well predicted by the FEM potential formulation. The impact of density or temperature gradients, however, is not well reproduced
Antoinat, Léonard. "Contribution à la caractérisation de la déformation et de la rupture dynamique de structures sous impact : Modélisations et approche expérimentale". Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0037/document.
Texto completo da fonteThe objective of this work is to propose approaches to model and to assess experimentally the structural impact on different media. A variety of analytic models and numerical simulations are developed comparing to experimental results. The first part of this work presents a discussion on the similitude between a water impact and an impact on a deformable solid structure. Water impact simulations of a deformable cylinder (without rupture) are performed by finite elements (FE, Coupled Eulerian Lagrangian) and SPH analysis. An analytical model of water impact is proposed for the prediction of peak force evolution. The analysis of results permits to design an impact programmer reproducing this peak force. FE longitudinal impact simulations on cylindrical tubes, with an adapted geometry, are performed and compared with some experiments. The “dynamic buckling” of tubes under impact (due to the material inelastic behavior and to strain waves) is observed. The second part deals with the low velocity perforation (< 10 m/s, strain rate < 1000 s-1) of thin plates. Some experiments on an instrumented drop test (force, displacement, plate shape, crack propagation) are analyzed. Shell FE simulations, with a damage rupture criteria implemented are performed. Parameters are identified by inverse method with the help of Charpy tests made on 2024 T3 aluminum alloy. An analysis of the peak force, during impact, leads to a good understanding of the perforation mechanism. In parallel, a new analytical model, based on an energetic approach of the perforation, is proposed and compared with FE simulations. The numerical perforation study is extended to high velocities and high strain rates (100 - 1000m/s, strain rate < 100 000 s-1) in order to identify different well-known transitions of perforation (Petalisation, petals' fragmentation, total plate's fragmentation)
Amado, Toni. "Modélisation d'un système dynamique à jeu du groupe moto-propulseur". Ecully, Ecole centrale de Lyon, 2006. http://www.theses.fr/2006ECDL0007.
Texto completo da fonteIn this document, we have studied the diesel engine vacuum pump drive non linear dynamics. The involved double-sided contact is represented by a classical torsion stiffness and a viscous torsion damping. The piecewise linear motion equation obtained is solved by a semi analytical method. A continuation technique, based on a semi analytical shooting method, is used to describe periodic orbits and their bifurcations. The chaotic behaviour is revealed by the computed Lyaopunov exponents and Poincaré applications. Finally, an experiment idealizing the vacuum pump system has been performed. Experimental and computed results will be confronted to validate the model and the analysis procedure
Allard, Antoine. "Percolation sur graphes aléatoires - modélisation et description analytique -". Thesis, Université Laval, 2014. http://www.theses.ulaval.ca/2014/30822/30822.pdf.
Texto completo da fonteGraphs are abstract mathematical objects used to model the interactions between the elements of complex systems. Their use is motivated by the fact that there exists a fundamental relationship between the structure of these interactions and the macroscopic properties of these systems. The structure of these graphs is analyzed within the paradigm of percolation theory whose tools and concepts contribute to a better understanding of the conditions for which these emergent properties appear. The underlying interactions of a wide variety of complex systems share many universal structural properties, and including these properties in a unified theoretical framework is one of the main challenges of the science of complex systems. Capitalizing on a multitype approach, a simple yet powerful idea, we have unified the models of percolation on random graphs published to this day in a single framework, hence yielding the most general and realistic framework to date. More than a mere compilation, this framework significantly increases the structural complexity of the graphs that can now be mathematically handled, and, as such, opens the way to many new research opportunities. We illustrate this assertion by using our framework to validate hypotheses hinted at by empirical results. First, we investigate how the network structure of some complex systems (e.g., power grids, social networks) enhances our ability to monitor them, and ultimately to control them. Second, we test the hypothesis that the “k-core” decomposition can act as an effective structure of graphs extracted from real complex systems. Third, we use our framework to identify the conditions for which a new immunization strategy against infectious diseases is optimal.
Kibbou, El Mehdi. "Contribution à la modélisation thermomécanique des vibrations en coupe oblique et à l'établissement d'un plan optimal de maintenance intégré à la production tenant compte des conditions d'usinage". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0234.
Texto completo da fonteIn this study, we are interested in a machining production system which is one of the manufacturing processes most adopted by the various mechanical industries (automotive, aviation…etc.). The objective of this multidisciplinary thesis (Mechanics and Industrial Engineering) is double: (1) the development of a new thermomechanical model of oblique cutting in dry machining and (2) the maximization of profit in order to establish a strategy production and a preventive maintenance plan.The coupling between the machining operation and the part "simultaneous optimization of production and maintenance costs" is done by considering the effect of cutting conditions on the generated surface quality and on the tool wear. In the proposed approach, wear is taken into account through Taylor's empirical law and the machined surface quality is predicted via a new model of vibrations in oblique cutting.The first objective of this work concerns the development of a new thermomechanical model of the oblique cutting with vibration. In this analytical cutting model, the vibratory system is assimilated to a system with a single degree of freedom in the tool feed direction. We take into account the coupling between tool oscillations, the thermomechanical process of chip formation as well as the regenerative effect. The latter results from the variation in the material quantity to be machined between two successive passes. The coupling between all of these mechanisms makes the problem to be solved strongly nonlinear. A resolution algorithm making it possible to reduce the computation time has been implemented.The second objective of the thesis is achieved through the development of an analytical model where the optimization consists in maximizing a profit integrating selling price of finished product, production and maintenance costs. We note the originality of this part consists in considering the impact of the machining conditions, especially the cutting speed, on the production durations and costs, the quality of the machined parts as well as the degradation of the production system. The impact of machining conditions on three fundamental aspects is therefore considered simultaneously for the "simultaneous optimization of production and maintenance costs" part. The first concerns the impact of machining conditions on production time and costs. The second concerns the impact on the degradation of the machining system and therefore on the optimal maintenance plan to be adopted. The third concerns the impact on the quality of the output product which directly affects the selling costs and more specifically the total profit. These interactions are taken into account through the development of an analytical model to establish an optimal integrated production maintenance plan for the machining system, illustrated by the optimal switching date for changing cutting speed and the optimal numbers of batches to produce before every preventive maintenance action for every production phase. Every production phase is characterized by a cutting speed
Hallal, Ali. "Modélisation analytique généralisée des propriétés élastiques des composites textiles". Versailles-St Quentin en Yvelines, 2013. http://www.theses.fr/2013VERS0004.
Texto completo da fonteThe use of textile composites has increased recently in advanced industries to replace traditional composites and laminates. The prediction of elastic properties of textile composites presents an important step to understand the mechanical behavior of these materials. The objective of this thesis is to propose a reliable analytical model benefits from analytical methods advantageous against numerical methods. The proposed generalized model has been applied to all kinds of textile composites, where it yields very good results especially for the Young's modulus and shear plane. The thesis consists is a thesis by articles/publications. The thesis consists of eight chapters: Coordinating chapter, six chapters correspond to six publications and a general conclusion
Kabagire, K. Daddy. "Modélisation expérimentale et analytique des propriétés rhéologiques des bétons autoplaçants". Thèse, Université de Sherbrooke, 2018. http://hdl.handle.net/11143/11635.
Texto completo da fonteGhoreishi, Seyed. "Modélisation analytique et caractérisation expérimentale du comportement de câbles synthétiques". Nantes, 2005. http://www.theses.fr/2005NANT2048.
Texto completo da fonteCapítulos de livros sobre o assunto "Modélisations analytiques"
Garrigues, Philippes. "Chapitre 7 : Techniques analytiques : criblages, modélisation, biomarqueurs et spéciation". In Chimie et expertise, 99–118. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1996-6-010.
Texto completo da fonteGarrigues, Philippes. "Chapitre 7 : Techniques analytiques : criblages, modélisation, biomarqueurs et spéciation". In Chimie et expertise, 99–118. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1996-6.c010.
Texto completo da fonteDIMITROV, Boyan. "Distributions et processus aléatoires liés aux modèles de files d’attente et de fiabilité". In Théorie des files d’attente 2, 91–147. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9004.ch3.
Texto completo da fonte